Storage system in a multimedia server must satisfy two contradicting requirements: real-timeliness and large number of parallel user requests. Efficient algorithms for data placement, disk head scheduling, and request admission control schemes are needed to support the requirements. In this paper, we propose efficient schemes to maximize system resource utilization and service availability: cyclic placement scheme, subgroup retrieval scheme, and measurement-based request admission control scheme. Performance analysis through simulation revealed that the amount of system buffers required can be reduced by 70% approximately.